Dental engine



(No Model.)

v W. A. KNOWLES.

`DFNTAL ENGINE. No. 373,141. Patented N0v.15, 1887.-

INVENTEHQ,I /@W ZM UNITED STATES PATENT OFFICE.,

ILLIAM Av. KNO\VLES, OF ALAMEDA, CALIFORNIA.

DENTAL Encina.

SPECIFICATION forming 'part of ALetters. Patent Nf373,1411, dated November 15, 1857.

Application lill-d July 14, 1F87. Serial No. 241.r37. (No model.)

T0 @ZZ whom it may concern:

Be itv known that I, WILLIAM A. KNowLEs, a citizen ofthe United States, residing in the city and county of Alameda, and State of California, haveinvented a. newand useful Denial Engine, of which the following is a specitiea' My invention relates to improvements in dental engines, which will be understood by reference to the accompanying drawings and the letters referring thereto.

Figure 1 isa broken sectional View showing the machine eut vertically through the eenter; Eig. 2, a broken front elevation; Fig. 3,a broken plan View, and' ig. 4 an elevation of the machine upon a reduced scale.

A represents the headb1ock which forms the outer shell, which supports the gear; B, the pivot post or sleeve; C, the driving-spindle; D and E, the miter driving-wheels; F, the pinion which gives motion to the cable-rod by means of thejournal-sleeve; G, the sliding bearing for the cable-rod; 1I, the guide-groove for the sliding bearing G to operate in; I and J the 1ocklevers. v

K and K L and L are the lock-notches, in which the lock-levers I and J operate; M and M', the returning-springs which operate the lock-levers I and J in locking the sliding bearing G in place.

N represents the adj ustablc bearing for the spindle C to operate iu.

0 represents the lock-lever, and P the lockspring for holding the bearing N from turning.

Q represents the lock-noteh for the spring R to catch upon. l

R represents the lock-spring forholding the door S when closed.

S represents the door which supports the sliding bearing for the cable-rod and allows egress to the gearing D and E, and allows the cable-rod to tip down to a vertical position when nothin use. y

T represents the hingel for the door S.

U represents the supporti11g-sleeve lor the head-block A and the main driving-spimlle.

V -and WIV represent mitergcar connected with the foot-power,.X thc .ily-wheel'. and -Y the treadle; Z, the sleeve of the cable. rod, which serves as a bearing for-thc pinion F, by which it is revolved.

The following is the construetion of my improved dentai engine: I construct the whole of Asuch metal as is generally employed in that class of machinery, except thatl sometimes face thegear D, E. and F with ruhherinstead of metal teeth, to afford a noiseless movement. -I bore the hole in the pivotsleeve B su'liciently large to allow the spindle C to revolve in the-same freely, but suliicientlyclose to in sure steadiness. I form the sliding beariugG heavy enough to support an extension long enough to supply any required bearing forthe. cableslecve Z, and to allow the attaehmentof the catch or lock levers .l audJand thesprings M and M. I form the groove H wit-h side guide-grooves, as shown in Fig. 3, at H H in the door 1 hinge the door S at T, and attach the catch-spring II- at the top to' interlock with the lock-notch Q. I lorm thelock-norches K and Ii and L and L to receive the end of the loel le\'e1s I and J l'or the purpose of locking the sliding bearing G. I 'employ a vconcave bearing for the top of the spindle C, which may be turned down upon the ,conical point of the spindle C. l

The following is the operation of my improved dcntal engine: The pivot-sleeve B revolrcsfcasily in the supportiiig-,sleeve U, and the cable-rod is readily turned in any required direction horizontally. 'lhe spindle-C being revolved by the loot-treadle,lthe wheels D and E are consequently revolved, and the pinion F, being in gear with t-he wheel E, as shown in Fig. l, isalsorerolved, thereby giving motion to the driltcable, which is operatedin the usual way. To reverse the motion of the drill or other instrument employed in working on the teeth, the thumb and finger are pressed upon the levers I and .I over thesprings Maud M', and the lever .I is withdrawn from the notch L and the lever I from the notch Il',and-

the bearing' or slide G is let down until the` pinion F impingcs upon the wheel D. The., levers I and .l are then released and cate-h into,

lhe notches K and K, thus lirmly looking the pinion and the wheel 1l in gear, thereby causing the pinion F to revolve in an opposite di-A rcelion.

lock-notch @when the doorS opens freely and. the cable is allowed to hang vertically.

'lo tip the cable down to a vertical position the spring-catch vlt is raised from thev 10d --gro'ove H andY pivot-post Bbddoor S, hinged at. T, Hhaving the sliding adjustable bearing G, cutclrnotches K, L, K', and L', the levers I and pring kEl, adjustable bearing N, catclrlever O, andspring l?, in combination with the sup porting-sleeve U, for the purpose of supporting the gear D, E, and F and giving motion to the same by means of the spindle U,construeted and operated substantially as and for the pur poses set forth.

2. The door S, in combination with thehend block A by means of the hinge T, the lock notch- Q and catch-spring R, for t'he purpose of placing the pinion F in gear with any corresponding gcar and tipping the cable-rod down to a vertiral position, constructed and operated substantially as and for the set forth.

3. The sliding bearing G, in combination with the door S by means of the groove H,the lock-notches K, L, K', and L', the levers I and J, and springs M and M', for the purpose of reversing the motion offthe pinion F by sliding up and down and bringingitaltcrnately in gear with the wheels D and E,'as described, coustructed and operated substantially as and for the purposes set forth.

4. The combination, with the sliding bearing G, ofthe levers I and J, the springs M and M', the lock-notches K and L and K and L', for the purpose of adjusting and locking thesame,

purposes constructed and operated substantially asand for the purposes set forth.

VILLIAM A. KNOWLES. \Vitncsses: E. H. THARP, JOHN H. REDsToNE. 

